#-*- encoding:utf-8 -*-
# Create your views here.
from django.http import HttpResponse,HttpResponseRedirect
from django.shortcuts import render,get_object_or_404
from django.core.urlresolvers import reverse

from models import Poll,Choice

def index(request):

    latest_poll_list = Poll.objects.order_by('-pub_date')[:5]
    context = {'latest_poll_list':latest_poll_list}
    return render(request,'polls/index.html',context)

def detail(request,poll_id):

    poll = get_object_or_404(Poll,pk=poll_id)

    return render(request,'polls/detail.html',{'poll':poll})

def results(request,poll_id):
    poll = get_object_or_404(Poll,pk=poll_id)
    return render(request,'polls/results.html',{'poll':poll})

def vote(request,poll_id):
    p = get_object_or_404(Poll,pk=poll_id)
    try:
        selected_choice = p.choice_set.get(pk=request.POST.get('choice'))
    except(KeyError,Choice.DoesNotExist):
        #Redisplay the poll voting form.
        return render(request,'polls/detail.html',{
            'poll':p,
            'error_message': "You didn't select a choice.",
        })
    else:
        selected_choice.votes += 1
        selected_choice.save()
        #Always return an HttpResponseRedirect after successfully dealing
        #with POST data.This prevents data from being posted twice if a
        #user hits the Back button.

    return HttpResponseRedirect(reverse('polls:results',args=(p.id,)))